AutoCodes – Buick – P2102 Buick

P2102 Buick Code - Throttle Actuator Control Motor Control Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) is the control center for the throttle body Throttle Actuator Control (TAC) system. Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2102 Buick indicates Throttle Actuator Control Motor Control Circuit Low Voltage.
Common causes: Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 562

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2102 Buick Description

The Engine Control Module (ECM) is the control center for the throttle body Throttle Actuator Control (TAC) system. The ECM determines the driver's intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the throttle body (TAC) motor. The throttle body (TAC) motor system uses the following circuits: Throttle body (TAC) motor control 1 and Throttle body (TAC) motor control 2.
Two processors are also used to monitor the throttle body (TAC) motor system data. Both processors are located within the ECM. Both processors monitor each other's data to verify that the indicated throttle position is correct.
The Diagnostic Trouble Code (DTC) will set when the ECM detects an overheating or over-current condition. The condition exists for 1 s.

OBDII Code P2102 Buick - Throttle Actuator Control Motor Control Circuit Low Voltage - AutoCodes.com — P2102 Buick Code - Throttle Actuator Control Motor Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2102 Buick?

Faulty Throttle Body Assembly
Throttle Body Assembly harness is open or shorted
Throttle Body Assembly circuit poor electrical connection

How to Fix the DTC P2102 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2102 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2102 Buick Code

1. What does OBDII code P2102 mean for a Buick?

P2102 indicates a problem with the throttle actuator control motor circuit, specifically that it is experiencing low voltage.

2. What are common symptoms of code P2102 in a Buick?

Symptoms may include reduced engine power, poor acceleration, a Check Engine Light, or the vehicle entering "limp mode."

3. What causes the P2102 code to trigger?

Common causes include a faulty throttle actuator motor, damaged wiring or connectors in the circuit, a malfunctioning throttle body, or a failing engine control module (ECM).

4. Can a dirty throttle body cause P2102?

Yes, a dirty or sticking throttle body can affect the throttle actuator motor's function and trigger this code.

5. How do you diagnose code P2102 in a Buick?

Diagnosis involves checking the throttle actuator motor, inspecting wiring and connectors for damage or corrosion, and testing the voltage and continuity of the circuit.

6. Can you drive a Buick with code P2102?

Driving with P2102 is not recommended, as it can lead to reduced engine performance and potentially unsafe driving conditions.

7. How is P2102 fixed in a Buick?

Repairs may include replacing the throttle actuator motor, cleaning or replacing the throttle body, repairing damaged wiring, or, in rare cases, replacing the ECM.

8. How much does it cost to fix P2102 on a Buick?

Repair costs can vary but typically range from $150 to $700, depending on whether the throttle body or actuator motor needs replacement.

9. Does a software update fix P2102 in some cases?

Yes, in some cases, a software update for the ECM may resolve issues related to P2102 if the problem stems from software-related throttle control errors.

10. Can a dead battery cause P2102 to appear?

A low or dead battery can cause voltage issues that might trigger P2102, so it's important to check the battery and charging system as part of the diagnosis.